SHOW

DESC, DESCRIBE

It shows the column information of a table, and it’s like a SHOW COLUMNS statement. For more details, see SHOW COLUMNS.

DESC tbl_name;
DESCRIBE tbl_name;

EXPLAIN

It shows the column information of a table, and it’s like a SHOW COLUMNS statement. For more details, see SHOW COLUMNS.

EXPLAIN tbl_name;

SHOW TABLES

It shows the list of all table names within a database. The name of the result column will be tables_in_<database name> and it will have one column. If you use the LIKE clause, you can search the table names matching this and if you use the WHERE clause, you can search table names with more general terms. SHOW FULL TABLES displays the second column, table_type together. The table must have the value, BASE TABLE and the view has the value, VIEW.

SHOW [FULL] TABLES [LIKE 'pattern' | WHERE expr];

The following shows the examples of this syntax.

SHOW TABLES;
Tables_in_demodb
======================
  'athlete'
  'code'
  'event'
  'game'
  'history'
  'nation'
  'olympic'
  'participant'
  'record'
  'stadium'
SHOW FULL TABLES;
  Tables_in_demodb     Table_type
============================================
  'athlete'             'BASE TABLE'
  'code'                'BASE TABLE'
  'event'               'BASE TABLE'
  'game'                'BASE TABLE'
  'history'             'BASE TABLE'
  'nation'              'BASE TABLE'
  'olympic'             'BASE TABLE'
  'participant'         'BASE TABLE'
  'record'              'BASE TABLE'
  'stadium'             'BASE TABLE'
SHOW FULL TABLES LIKE '%c%';
  Tables_in_demodb      Table_type
============================================
  'code'                'BASE TABLE'
  'olympic'             'BASE TABLE'
  'participant'         'BASE TABLE'
  'record'              'BASE TABLE'
SHOW FULL TABLES WHERE table_type = 'BASE TABLE' and TABLES_IN_demodb LIKE '%co%';
  Tables_in_demodb      Table_type
============================================
  'code'                'BASE TABLE'
  'record'              'BASE TABLE'

SHOW COLUMNS

It shows the column information of a table. You can use the LIKE clause to search the column names matching it. If you use the WHERE clause, you can search column names with more general terms like, “General Considerations for All SHOW Statements.”.

SHOW [FULL] COLUMNS {FROM | IN} tbl_name [LIKE 'pattern' | WHERE expr];

If a FULL keyword is used, it shows the additional information, collation and comment.

SHOW FIELDS is the same statement as SHOW COLUMNS.

The DESCRIBE (abbreviated DESC) statement and the EXPLAIN statement provide the same information with SHOW COLUMNS, but they don’t support LIKE clause or WHERE clause.

This query has the following columns:

Column name

Type

Description

Field

VARCHAR

Column name

Type

VARCHAR

Column data type

Null

VARCHAR

If you can store NULL, the value is YES; if not, it is NO

Key

VARCHAR

Whether a column has an index or not. If there is more than one key value in the given column of a table, this displays only the one that appears first in the order of PRI, UNI and MUL.
  • If the key is a space, the column doesn’t have an index, it is not the first column in the multiple column index or the index is non-unique.

  • If the value is PRI, it is a primary key or the primary key of multiple columns.

  • If the value is UNI, it is a unique index. (The unique index allows multiple NULL values but you can also set a NOT NULL constraint.)

  • If the value is MUL, it is the first column of the non-unique index that allows the given value to be displayed in the column several times. If the column composes a composite unique index, the value will be MUL. The combination of column values can be unique but the value of each column can appear several times.

Default

VARCHAR

Default value defined in the column

Extra

VARCHAR

Additional information available on the given column. For the column with AUTO_INCREMENT constraint, it shows the ‘auto_increment’.

The following shows the examples of this syntax.

SHOW COLUMNS FROM athlete;
  Field                 Type                  Null       Key          Default               Extra
================================================================================================================
  'code'                'INTEGER'             'NO'       'PRI'        NULL                  'auto_increment'
  'name'                'VARCHAR(40)'         'NO'       ''           NULL                  ''
  'gender'              'CHAR(1)'             'YES'      ''           NULL                  ''
  'nation_code'         'CHAR(3)'             'YES'      ''           NULL                  ''
  'event'               'VARCHAR(30)'         'YES'      ''           NULL                  ''
SHOW COLUMNS FROM athlete WHERE field LIKE '%c%';
  Field                 Type                  Null       Key          Default               Extra
================================================================================================================
  'code'                'INTEGER'             'NO'       'PRI'        NULL                  'auto_increment'
  'nation_code'         'CHAR(3)'             'YES'      ''           NULL                  ''
SHOW COLUMNS FROM athlete  WHERE "type" = 'INTEGER' and "key"='PRI' AND extra='auto_increment';
  Field                 Type                  Null       Key          Default               Extra
================================================================================================================
  'code'                'INTEGER'             'NO'       'PRI'        NULL                  'auto_increment'
SHOW FULL COLUMNS FROM athlete WHERE field LIKE '%c%';
  Field                 Type                  Collation             Null                  Key                   Default               Extra                 Comment
================================================================================================================================================================================
  'code'                'INTEGER'             NULL                  'NO'                  'PRI'                 NULL                  'auto_increment'      NULL
  'nation_code'         'CHAR(3)'             'iso88591_bin'        'YES'                 ''                    NULL                  ''                    NULL

SHOW INDEX

It shows the index information.

SHOW {INDEX | INDEXES | KEYS } {FROM | IN} tbl_name;

This query has the following columns:

Column name

Type

Description

Table

VARCHAR

Table name

Non_unique

INTEGER

Unique or not
  • 0: Duplicated value is not allowed

  • 1: Duplicated value is allowed

Key_name

VARCHAR

Index name

Seq_in_index

INTEGER

Serial number of the column in the index. Starts from 1.

Column_name

VARCHAR

Column name

Collation

VARCHAR

Method of sorting columns in the index. ‘A’ means ascending and NULL means not sorted.

Cardinality

INTEGER

The number of values measuring the unique values in the index. Higher cardinality increases the opportunity of using an index. This value is updated every time SHOW INDEX is executed. Note that this is an approximate value.

Sub_part

INTEGER

The number of bytes of the indexed characters if the columns are indexed partially. NULL if all columns are indexed.

Packed

Shows how keys are packed. If they are not packed, it will be NULL. Currently no support.

Null

VARCHAR

YES if a column can include NULL, NO if not.

Index_type

VARCHAR

Index to be used (currently, only the BTREE is supported.)

Func

VARCHAR

A function which is used in a function-based index

Comment

VARCHAR

Comment to describe the index

Visible

VARCHAR

Shows the Visibility of an index (YES/NO)

The following shows the examples of this syntax.

SHOW INDEX IN athlete;
Table                  Non_unique  Key_name              Seq_in_index  Column_name           Collation             Cardinality     Sub_part  Packed                Null                  Index_type            Func                  Comment               Visible
=================================================================================================================================================================================================================================================================================
'athlete'                       0  'pk_athlete_code'                1  'code'                'A'                          6677         NULL  NULL                  'NO'                  'BTREE'               NULL                  NULL                  'YES'
CREATE TABLE tbl1 (i1 INTEGER , i2 INTEGER NOT NULL, i3 INTEGER UNIQUE, s1 VARCHAR(10), s2 VARCHAR(10), s3 VARCHAR(10) UNIQUE);

CREATE INDEX i_tbl1_i1 ON tbl1 (i1 DESC);
CREATE INDEX i_tbl1_s1 ON tbl1 (s1 (7));
CREATE INDEX i_tbl1_i1_s1 ON tbl1 (i1, s1);
CREATE UNIQUE INDEX i_tbl1_i2_s2 ON tbl1 (i2, s2);

ALTER INDEX i_tbl1_s1 ON tbl1 INVISIBLE;

SHOW INDEXES FROM tbl1;
Table                  Non_unique  Key_name              Seq_in_index  Column_name           Collation             Cardinality     Sub_part  Packed                Null                  Index_type            Func                  Comment               Visible
=================================================================================================================================================================================================================================================================================
'tbl1'                          1  'i_tbl1_i1'                      1  'i1'                  'D'                             0         NULL  NULL                  'YES'                 'BTREE'               NULL                  NULL                  'YES'
'tbl1'                          1  'i_tbl1_i1_s1'                   1  'i1'                  'A'                             0         NULL  NULL                  'YES'                 'BTREE'               NULL                  NULL                  'YES'
'tbl1'                          1  'i_tbl1_i1_s1'                   2  's1'                  'A'                             0         NULL  NULL                  'YES'                 'BTREE'               NULL                  NULL                  'YES'
'tbl1'                          0  'i_tbl1_i2_s2'                   1  'i2'                  'A'                             0         NULL  NULL                  'NO'                  'BTREE'               NULL                  NULL                  'YES'
'tbl1'                          0  'i_tbl1_i2_s2'                   2  's2'                  'A'                             0         NULL  NULL                  'YES'                 'BTREE'               NULL                  NULL                  'YES'
'tbl1'                          1  'i_tbl1_s1'                      1  's1'                  'A'                             0            7  NULL                  'YES'                 'BTREE'               NULL                  NULL                  'NO'
'tbl1'                          0  'u_tbl1_i3'                      1  'i3'                  'A'                             0         NULL  NULL                  'YES'                 'BTREE'               NULL                  NULL                  'YES'
'tbl1'                          0  'u_tbl1_s3'                      1  's3'                  'A'                             0         NULL  NULL                  'YES'                 'BTREE'               NULL                  NULL                  'YES'

SHOW COLLATION

It lists collations supported by the database. If LIKE clause is present, it indicates which collation names to match.

SHOW COLLATION [ LIKE 'pattern' ];

This query has the following columns:

Column name

Type

Description

Collation

VARCHAR

Collation name

Charset

CHAR(1)

Charset name

Id

INTEGER

Collation ID

Built_in

CHAR(1)

Built-in collation or not. Built-in collations are impossible to add or remove because they are hard-coded.

Expansions

CHAR(1)

Collation with expansion or not. For details, see Expansion.

Strength

CHAR(1)

The number of levels to be considered in comparison, and the character order can be different by this number. For details, see Collation Properties.

The following shows the examples of this syntax.

SHOW COLLATION;
  Collation             Charset                        Id  Built_in              Expansions            Strength
===========================================================================================================================
  'euckr_bin'           'euckr'                         8  'Yes'                 'No'                  'Not applicable'
  'iso88591_bin'        'iso88591'                      0  'Yes'                 'No'                  'Not applicable'
  'iso88591_en_ci'      'iso88591'                      3  'Yes'                 'No'                  'Not applicable'
  'iso88591_en_cs'      'iso88591'                      2  'Yes'                 'No'                  'Not applicable'
  'utf8_bin'            'utf8'                          1  'Yes'                 'No'                  'Not applicable'
  'utf8_de_exp'         'utf8'                         76  'No'                  'Yes'                 'Tertiary'
  'utf8_de_exp_ai_ci'   'utf8'                         72  'No'                  'Yes'                 'Primary'
  'utf8_en_ci'          'utf8'                          5  'Yes'                 'No'                  'Not applicable'
  'utf8_en_cs'          'utf8'                          4  'Yes'                 'No'                  'Not applicable'
  'utf8_es_cs'          'utf8'                         85  'No'                  'No'                  'Quaternary'
  'utf8_fr_exp_ab'      'utf8'                         94  'No'                  'Yes'                 'Tertiary'
  'utf8_gen'            'utf8'                         32  'No'                  'No'                  'Quaternary'
  'utf8_gen_ai_ci'      'utf8'                         37  'No'                  'No'                  'Primary'
  'utf8_gen_ci'         'utf8'                         44  'No'                  'No'                  'Secondary'
  'utf8_ja_exp'         'utf8'                        124  'No'                  'Yes'                 'Tertiary'
  'utf8_ja_exp_cbm'     'utf8'                        125  'No'                  'Yes'                 'Tertiary'
  'utf8_km_exp'         'utf8'                        132  'No'                  'Yes'                 'Quaternary'
  'utf8_ko_cs'          'utf8'                          7  'Yes'                 'No'                  'Not applicable'
  'utf8_ko_cs_uca'      'utf8'                        133  'No'                  'No'                  'Quaternary'
  'utf8_tr_cs'          'utf8'                          6  'Yes'                 'No'                  'Not applicable'
  'utf8_tr_cs_uca'      'utf8'                        205  'No'                  'No'                  'Quaternary'
  'utf8_vi_cs'          'utf8'                        221  'No'                  'No'                  'Quaternary'
SHOW COLLATION LIKE '%_ko_%';
  Collation             Charset                        Id  Built_in              Expansions            Strength
===========================================================================================================================
  'utf8_ko_cs'          'utf8'                          7  'Yes'                 'No'                  'Not applicable'
  'utf8_ko_cs_uca'      'utf8'                        133  'No'                  'No'                  'Quaternary'

SHOW TIMEZONES

It shows the timezone information which the current CUBRID supports.

SHOW [FULL] TIMEZONES [ LIKE 'pattern' ];

If FULL is not specified, one column which has timezone’s region names is displayed. The name of this column is timezone_region.

If FULL is specified, four columns which have timezone information are displayed.

If LIKE clause is present, it indicates which timezone_region names to match.

Column name

Type

Description

timezone_region

VARCHAR(32)

Timezone region name

region_offset

VARCHAR(32)

Offset of timezone (daylight saving time is not considered)

dst_offset

VARCHAR(32)

Offset of daylight saving time (applied to timezone region) which is currently considered

dst_abbreviation

VARCHAR(32)

An abbreviation of the daylight saving time which is currently applied for the region

The information listed for the second, third and fourth columns is for the current date and time.

If a timezone region doesn’t have daylight saving time rules at all then the dst_offset and dst_abbreviation columns will contain NULL values.

If at the current date, there aren’t daylight saving time rules that apply, then dst_offset will be set to 0 and dst_abbreviation will be the empty string.

The LIKE condition without the WHERE condition is applied on the first column. The WHERE condition may be used to filter the output.

SHOW TIMEZONES;
timezone_region
======================
'Africa/Abidjan'
'Africa/Accra'
'Africa/Addis_Ababa'
'Africa/Algiers'
'Africa/Asmara'
'Africa/Asmera'
...
'US/Michigan'
'US/Mountain'
'US/Pacific'
'US/Samoa'
'UTC'
'Universal'
'W-SU'
'WET'
'Zulu'
SHOW FULL TIMEZONES;
timezone_region       region_offset         dst_offset            dst_abbreviation
===================================================================================
'Africa/Abidjan'      '+00:00'              '+00:00'              'GMT'
'Africa/Accra'        '+00:00'              NULL                  NULL
'Africa/Addis_Ababa'  '+03:00'              '+00:00'              'EAT'
'Africa/Algiers'      '+01:00'              '+00:00'              'CET'
'Africa/Asmara'       '+03:00'              '+00:00'              'EAT'
'Africa/Asmera'       '+03:00'              '+00:00'              'EAT'
...
'US/Michigan'         '-05:00'              '+00:00'              'EST'
'US/Mountain'         '-07:00'              '+00:00'              'MST'
'US/Pacific'          '-08:00'              '+00:00'              'PST'
'US/Samoa'            '-11:00'              '+00:00'              'SST'
'UTC'                 '+00:00'              '+00:00'              'UTC'
'Universal'           '+00:00'              '+00:00'              'UTC'
'W-SU'                '+04:00'              '+00:00'              'MSK'
'WET'                 '+00:00'              '+00:00'              'WET'
'Zulu'                '+00:00'              '+00:00'              'UTC'
SHOW FULL TIMEZONES LIKE '%Paris%';
timezone_region       region_offset         dst_offset            dst_abbreviation
========================================================================================
'Europe/Paris'        '+01:00'              '+00:00'              'CET'

SHOW GRANTS

It shows the permissions associated with the database user accounts.

SHOW GRANTS FOR 'user';

The following shows the examples of this syntax.

CREATE TABLE testgrant (id INT);
CREATE USER user1;
GRANT INSERT,SELECT ON testgrant TO user1;

SHOW GRANTS FOR user1;
  Grants for USER1
======================
  'GRANT INSERT, SELECT ON testgrant TO USER1'

SHOW CREATE TABLE

When a table name is specified, It shows the CREATE TABLE statement of the table.

SHOW CREATE TABLE table_name;
SHOW CREATE TABLE nation;
  TABLE                 CREATE TABLE
============================================
  'nation'               'CREATE TABLE [nation] ([code] CHARACTER(3) NOT NULL,
[name] CHARACTER VARYING(40) NOT NULL, [continent] CHARACTER VARYING(10),
[capital] CHARACTER VARYING(30),  CONSTRAINT [pk_nation_code] PRIMARY KEY  ([code]))
COLLATE iso88591_bin'

SHOW CREATE TABLE statement does not display as the user’s written syntax. For example, the comment that user wrote is not displayed, and table names and column names are always displayed as lower case letters.

SHOW CREATE VIEW

It shows the corresponding CREATE VIEW statement if view name is specified.

SHOW CREATE VIEW view_name;

The following shows the examples of this syntax.

SHOW CREATE VIEW db_class;
  View              Create View
========================================
  'db_class'       'SELECT c.class_name, CAST(c.owner.name AS VARCHAR(255)), CASE c.class_type WHEN 0 THEN 'CLASS' WHEN 1 THEN 'VCLASS' ELSE
                   'UNKNOW' END, CASE WHEN MOD(c.is_system_class, 2) = 1 THEN 'YES' ELSE 'NO' END, CASE WHEN c.sub_classes IS NULL THEN 'NO'
                   ELSE NVL((SELECT 'YES' FROM _db_partition p WHERE p.class_of = c and p.pname IS NULL), 'NO') END, CASE WHEN
                   MOD(c.is_system_class / 8, 2) = 1 THEN 'YES' ELSE 'NO' END FROM _db_class c WHERE CURRENT_USER = 'DBA' OR {c.owner.name}
                   SUBSETEQ (  SELECT SET{CURRENT_USER} + COALESCE(SUM(SET{t.g.name}), SET{})  FROM db_user u, TABLE(groups) AS t(g)  WHERE
                   u.name = CURRENT_USER) OR {c} SUBSETEQ (  SELECT SUM(SET{au.class_of})  FROM _db_auth au  WHERE {au.grantee.name} SUBSETEQ
                   (  SELECT SET{CURRENT_USER} + COALESCE(SUM(SET{t.g.name}), SET{})  FROM db_user u, TABLE(groups) AS t(g)  WHERE u.name =
                   CURRENT_USER) AND  au.auth_type = 'SELECT')'

SHOW ACCESS STATUS

SHOW ACCESS STATUS statement displays login information regarding database accounts. Only database’s DBA account can use this statement.

SHOW ACCESS STATUS [LIKE 'pattern' | WHERE expr] ;

This statement displays the following columns.

Column name

Type

Description

user_name

VARCHAR(32)

DB user’s account

last_access_time

DATETIME

Last time that the database user accessed

last_access_host

VARCHAR(32)

Lastly accessed host

program_name

VARCHAR(32)

The name of client program(broker_cub_cas_1, csql ..)

The following shows the result of running this statement.

SHOW ACCESS STATUS;
  user_name last_access_time last_access_host program_name
=============================================================================
  'DBA' 08:19:31.000 PM 02/10/2014 127.0.0.1 'csql'
  'PUBLIC' NULL NULL NULL

Note

The above login information which SHOW ACCESS STATUS shows is initialized when the database is restarted, and this query is not replication in HA environment; therefore, each node shows the different result.

SHOW EXEC STATISTICS

It shows statistics information of executing query.

  • To start collecting @collect_exec_stats statistics information, configure the value of session variable @collect_exec_stats to 1; to stop, configure it to 0.

  • It outputs the result of collecting statistics information.

    • The SHOW EXEC STATISTICS statement outputs four part of data page statistics information; data_page_fetches, data_page_dirties, data_page_ioreads, and data_page_iowrites. The result columns consist of variable column (name of statistics name) and value column (value of statistics value). Once the SHOW EXEC STATISTICS statement is executed, the statistics information which has been accumulated is initialized.

    • The SHOW EXEC STATISTICS ALL statement outputs all items of statistics information.

For details, see statdump.

SHOW EXEC STATISTICS [ALL];

The following shows the examples of this syntax.

-- set session variable @collect_exec_stats as 1 to start collecting the statistical information.
SET @collect_exec_stats = 1;
SELECT * FROM db_class;

-- print the statistical information of the data pages.
SHOW EXEC STATISTICS;
variable                value
===============================
'data_page_fetches'     332
'data_page_dirties'     85
'data_page_ioreads'     18
'data_page_iowrites'    28
SELECT * FROM db_index;

-- print all of the statistical information.
SHOW EXEC STATISTICS ALL;
variable                                value
============================================
'file_creates'                          0
'file_removes'                          0
'file_ioreads'                          6
'file_iowrites'                         0
'file_iosynches'                        0
'data_page_fetches'                     548
'data_page_dirties'                     34
'data_page_ioreads'                     6
'data_page_iowrites'                    0
'log_page_ioreads'                      0
'log_page_iowrites'                     0
'log_append_records'                    0
'log_archives'                          0
'log_start_checkpoints'                 0
'log_end_checkpoints'                   0
'log_wals'                              0
'page_locks_acquired'                   13
'object_locks_acquired'                 9
'page_locks_converted'                  0
'object_locks_converted'                0
'page_locks_re-requested'               0
'object_locks_re-requested'             8
'page_locks_waits'                      0
'object_locks_waits'                    0
'tran_commits'                          3
'tran_rollbacks'                        0
'tran_savepoints'                       0
'tran_start_topops'                     6
'tran_end_topops'                       6
'tran_interrupts'                       0
'btree_inserts'                         0
'btree_deletes'                         0
'btree_updates'                         0
'btree_covered'                         0
'btree_noncovered'                      2
'btree_resumes'                         0
'btree_multirange_optimization'         0
'query_selects'                         4
'query_inserts'                         0
'query_deletes'                         0
'query_updates'                         0
'query_sscans'                          2
'query_iscans'                          4
'query_lscans'                          0
'query_setscans'                        2
'query_methscans'                       0
'query_nljoins'                         2
'query_mjoins'                          0
'query_objfetches'                      0
'query_holdable_cursors'                0
'sort_io_pages'                         0
'sort_data_pages'                       0
'network_requests'                      88
'adaptive_flush_pages'                  0
'adaptive_flush_log_pages'              0
'adaptive_flush_max_pages'              0
'prior_lsa_list_size'                   0
'prior_lsa_list_maxed'                  0
'prior_lsa_list_removed'                0
'heap_stats_bestspace_entries'          0
'heap_stats_bestspace_maxed'            0

Diagnostics

SHOW VOLUME HEADER

It shows the volume header of the specified volume in one row.

SHOW VOLUME HEADER OF volume_id;

This query has the following columns:

Column name

Type

Description

Volume_id

INT

Volume identifier

Magic_symbol

VARCHAR(100)

Magic value for for a volume file

Io_page_size

INT

Size of DB volume

Purpose

VARCHAR(32)

Volume purposes, ‘Permanent data purpose’ or ‘Temporary data purpose’

Type

VARCHAR(32)

Volume type, ‘Permanent Volume’ or ‘Temporary Volume’

Sector_size_in_pages

INT

Size of sector in pages

Num_total_sectors

INT

Total number of sectors

Num_free_sectors

INT

Number of free sectors

Num_max_sectors

INT

Maximum number of sectors

Hint_alloc_sector

INT

Hint for next sector to be allocated

Sector_alloc_table_size_in_pages

INT

Size of sector allocation table in page

Sector_alloc_table_first_page

INT

First page of sector allocation table

Page_alloc_table_size_in_pages

INT

Size of page allocation table in page

Page_alloc_table_first_page

INT

First page of page allocation table

Last_system_page

INT

Last system page

Creation_time

DATETIME

Database creation time

Db_charset

INT

Charset number of database

Checkpoint_lsa

VARCHAR(64)

Lowest log sequence address to start the recovery process of this volume

Boot_hfid

VARCHAR(64)

System Heap file for booting purposes and multi volumes

Full_name

VARCHAR(255)

The full path of volume

Next_volume_id

INT

Next volume identifier

Next_vol_full_name

VARCHAR(255)

The full path of next volume

Remarks

VARCHAR(64)

Volume remarks

The following shows the examples of this syntax.

-- csql> ;line on
SHOW VOLUME HEADER OF 0;
<00001> Volume_id                       : 0
        Magic_symbol                    : 'MAGIC SYMBOL = CUBRID/Volume at disk location = 32'
        Io_page_size                    : 16384
        Purpose                         : 'Permanent data purpose'
        Type                            : 'Permanent Volume'
        Sector_size_in_pages            : 64
        Num_total_sectors               : 512
        Num_free_sectors                : 459
        Num_max_sectors                 : 512
        Hint_alloc_sector               : 0
        Sector_alloc_table_size_in_pages: 1
        Sector_alloc_table_first_page   : 1
        Last_system_page                : 1
        Creation_time                   : 09:46:41.000 PM 05/23/2017
        Db_charset                      : 3
        Checkpoint_lsa                  : '(0|12832)'
        Boot_hfid                       : '(0|41|50)'
        Full_name                       : '/home1/brightest/CUBRID/databases/demodb/demodb'
        Next_volume_id                  : -1
        Next_vol_full_name              : ''
        Remarks                         : ''

SHOW LOG HEADER

It shows the header information of an active log file.

SHOW LOG HEADER [OF file_name];

If you omit OF file_name, it shows the header information of a memory; if you include OF file_name, it shows the header information of file_name.

This query has the following columns:

Column name

Type

Description

Volume_id

INT

Volume identifier

Magic_symbol

VARCHAR(32)

Magic value for log file

Magic_symbol_location

INT

Magic symbol location from log page

Creation_time

DATETIME

Database creation time

Release

VARCHAR(32)

CUBRID Release version

Compatibility_disk_version

VARCHAR(32)

Compatibility of the database against the current release of CUBRID

Db_page_size

INT

Size of pages in the database

Log_page_size

INT

Size of log pages in the database

Shutdown

INT

Was the log shutdown

Next_trans_id

INT

Next transaction identifier

Num_avg_trans

INT

Number of average transactions

Num_avg_locks

INT

Average number of object locks

Num_active_log_pages

INT

Number of pages in the active log portion

Db_charset

INT

Charset number of database

First_active_log_page

BIGINT

Logical pageid at physical location 1 in active log

Current_append

VARCHAR(64)

Current append location

Checkpoint

VARCHAR(64)

Lowest log sequence address to start the recovery process

Next_archive_page_id

BIGINT

Next logical page to archive

Active_physical_page_id

INT

Physical location of logical page to archive

Next_archive_num

INT

Next log archive number

Last_archive_num_for_syscrashes

INT

Last log archive needed for system crashes

Last_deleted_archive_num

INT

Last deleted archive number

Backup_lsa_level0

VARCHAR(64)

LSA of backup level 0

Backup_lsa_level1

VARCHAR(64)

LSA of backup level 1

Backup_lsa_level2

VARCHAR(64)

LSA of backup level 2

Log_prefix

VARCHAR(256)

Log prefix name

Has_logging_been_skipped

INT

Whether or not logging skipped

Perm_status

VARCHAR(64)

Reserved for future expansion

Backup_info_level0

VARCHAR(128)

detail information of backup level 0. currently only backup start-time is used

Backup_info_level1

VARCHAR(128)

detail information of backup level 1. currently only backup start-time is used

Backup_info_level2

VARCHAR(128)

detail information of backup level 2. currently only backup start-time is used

Ha_server_state

VARCHAR(32)

current ha state, one of flowing value: na, idle, active, to-be-active, standby, to-be-standby, maintenance, dead

Ha_file

VARCHAR(32)

ha replication status, one of following value: clear, archived, sync

Eof_lsa

VARCHAR(64)

EOF LSA

Smallest_lsa_at_last_checkpoint

VARCHAR(64)

The smallest LSA of the last checkpoint, can be NULL LSA

Next_mvcc_id

BIGINT

The next MVCCID will be used for the next transaction

Mvcc_op_log_lsa

VARCHAR(32)

The LSA used to link log entries for MVCC operation

Last_block_oldest_mvcc_id

BIGINT

Used to find the oldest MVCCID in a block of log data, can be NULL

Last_block_newest_mvcc_id

BIGINT

Used to find the newest MVCCID in a block of log data, can be NULL

The following shows the examples of this syntax.

-- csql> ;line on
SHOW LOG HEADER;
<00001> Volume_id                      : -2
        Magic_symbol                   : 'CUBRID/LogActive'
        Magic_symbol_location          : 16
        Creation_time                  : 09:46:41.000 PM 05/23/2017
        Release                        : '10.0.0'
        Compatibility_disk_version     : '10'
        Db_page_size                   : 16384
        Log_page_size                  : 16384
        Shutdown                       : 0
        Next_trans_id                  : 17
        Num_avg_trans                  : 3
        Num_avg_locks                  : 30
        Num_active_log_pages           : 1279
        Db_charset                     : 3
        First_active_log_page          : 0
        Current_append                 : '(102|5776)'
        Checkpoint                     : '(101|7936)'
        Next_archive_page_id           : 0
        Active_physical_page_id        : 1
        Next_archive_num               : 0
        Last_archive_num_for_syscrashes: -1
        Last_deleted_archive_num       : -1
        Backup_lsa_level0              : '(-1|-1)'
        Backup_lsa_level1              : '(-1|-1)'
        Backup_lsa_level2              : '(-1|-1)'
        Log_prefix                     : 'mvccdb'
        Has_logging_been_skipped       : 0
        Perm_status                    : 'LOG_PSTAT_CLEAR'
        Backup_info_level0             : 'time: N/A'
        Backup_info_level1             : 'time: N/A'
        Backup_info_level2             : 'time: N/A'
        Ha_server_state                : 'idle'
        Ha_file                        : 'UNKNOWN'
        Eof_lsa                        : '(102|5776)'
        Smallest_lsa_at_last_checkpoint: '(101|7936)'
        Next_mvcc_id                   : 6
        Mvcc_op_log_lsa                : '(102|5488)'
        Last_block_oldest_mvcc_id      : 4
        Last_block_newest_mvcc_id      : 5
SHOW LOG HEADER OF 'demodb_lgat';
<00001> Volume_id                      : -2
        Magic_symbol                   : 'CUBRID/LogActive'
        Magic_symbol_location          : 16
        Creation_time                  : 09:46:41.000 PM 05/23/2017
        Release                        : '10.0.0'
        Compatibility_disk_version     : '10'
        Db_page_size                   : 16384
        Log_page_size                  : 16384
        Shutdown                       : 0
        Next_trans_id                  : 15
        Num_avg_trans                  : 3
        Num_avg_locks                  : 30
        Num_active_log_pages           : 1279
        Db_charset                     : 3
        First_active_log_page          : 0
        Current_append                 : '(101|8016)'
        Checkpoint                     : '(101|7936)'
        Next_archive_page_id           : 0
        Active_physical_page_id        : 1
        Next_archive_num               : 0
        Last_archive_num_for_syscrashes: -1
        Last_deleted_archive_num       : -1
        Backup_lsa_level0              : '(-1|-1)'
        Backup_lsa_level1              : '(-1|-1)'
        Backup_lsa_level2              : '(-1|-1)'
        Log_prefix                     : 'mvccdb'
        Has_logging_been_skipped       : 0
        Perm_status                    : 'LOG_PSTAT_CLEAR'
        Backup_info_level0             : 'time: N/A'
        Backup_info_level1             : 'time: N/A'
        Backup_info_level2             : 'time: N/A'
        Ha_server_state                : 'idle'
        Ha_file                        : 'UNKNOWN'
        Eof_lsa                        : '(101|8016)'
        Smallest_lsa_at_last_checkpoint: '(101|7936)'
        Next_mvcc_id                   : 4
        Mvcc_op_log_lsa                : '(-1|-1)'
        Last_block_oldest_mvcc_id      : NULL
        Last_block_newest_mvcc_id      : NULL

SHOW ARCHIVE LOG HEADER

It shows the header information of an archive log file.

SHOW ARCHIVE LOG HEADER OF file_name;

This query has the following columns:

Column name

Type

Description

Volume_id

INT

Identifier of log volume

Magic_symbol

VARCHAR(32)

Magic value for file/magic Unix utility

Magic_symbol_location

INT

Magic symbol location from log page

Creation_time

DATETIME

Database creation time

Next_trans_id

BIGINT

Next transaction identifier

Num_pages

INT

Number of pages in the archive log

First_page_id

BIGINT

Logical page id at physical location 1 in archive log

Archive_num

INT

The archive log number

The following shows the examples of this syntax.

-- csql> ;line on
SHOW ARCHIVE LOG HEADER OF 'demodb_lgar001';
<00001> Volume_id            : -20
        Magic_symbol         : 'CUBRID/LogArchive'
        Magic_symbol_location: 16
        Creation_time        : 04:42:28.000 PM 12/11/2013
        Next_trans_id        : 22695
        Num_pages            : 1278
        First_page_id        : 1278
        Archive_num          : 1

SHOW HEAP HEADER

It shows shows the header page of the table.

SHOW [ALL] HEAP HEADER OF table_name;
  • ALL: If “ALL” is given in syntax in the partition table, the basic table and its partitioned tables are shown.

This query has the following columns:

Column name

Type

Description

Class_name

VARCHAR(256)

Table name

Class_oid

VARCHAR(64)

Format: (volid|pageid|slotid)

Volume_id

INT

Volume identifier where the file reside

File_id

INT

File identifier

Header_page_id

INT

First page identifier (the header page)

Overflow_vfid

VARCHAR(64)

Overflow file identifier (if any)

Next_vpid

VARCHAR(64)

Next page (i.e., the 2nd page of heap file)

Unfill_space

INT

Stop inserting when page has run below this. leave it for updates

Estimates_num_pages

BIGINT

Estimation of number of heap pages.

Estimates_num_recs

BIGINT

Estimation of number of objects in heap

Estimates_avg_rec_len

INT

Estimation total length of records

Estimates_num_high_best

INT

Number of pages in the best array that we believe have at least HEAP_DROP_FREE_SPACE. When this number goes to zero and there are at least other HEAP_NUM_BEST_SPACESTATS best pages, we look for them

Estimates_num_others_high_best

INT

Total of other believed known best pages, which are not included in the best array and we believe they have at least HEAP_DROP_FREE_SPACE

Estimates_head

INT

Head of best circular array

Estimates_best_list

VARCHAR(512)

Format: ‘((best[0].vpid.volid|best[0].vpid.pageid), best[0].freespace), … , ((best[9].vpid.volid|best[9].vpid.pageid), best[9].freespace)’

Estimates_num_second_best

INT

Number of second best hints. The hints are in “second_best” array. They are used when finding new best pages.

Estimates_head_second_best

INT

Index of head of second best hints. A new second best hint will be stored on this index.

Estimates_num_substitutions

INT

Number of page substitutions. This will be used to insert a new second best page into second best hints.

Estimates_second_best_list

VARCHAR(512)

Format: ‘(second_best[0].vpid.volid|second_best[0].vpid.pageid), … , (second_best[9].vpid.volid|second_best[9].vpid.pageid)’

Estimates_last_vpid

VARCHAR(64)

Format: ‘(volid|pageid)’

Estimates_full_search_vpid

VARCHAR(64)

Format: ‘(volid|pageid)’

The following shows the examples of this syntax.

-- csql> ;line on
SHOW HEAP HEADER OF athlete;
<00001> Class_name                    : 'athlete'
        Class_oid                     : '(0|463|8)'
        Volume_id                     : 0
        File_id                       : 147
        Header_page_id                : 590
        Overflow_vfid                 : '(-1|-1)'
        Next_vpid                     : '(0|591)'
        Unfill_space                  : 1635
        Estimates_num_pages           : 27
        Estimates_num_recs            : 6677
        Estimates_avg_rec_len         : 54
        Estimates_num_high_best       : 1
        Estimates_num_others_high_best: 0
        Estimates_head                : 0
        Estimates_best_list           : '((0|826), 14516), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1),0), ((-1|-1), 0)'
        Estimates_num_second_best     : 0
        Estimates_head_second_best    : 0
        Estimates_tail_second_best    : 0
        Estimates_num_substitutions   : 0
        Estimates_second_best_list    : '(-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1)'
        Estimates_last_vpid           : '(0|826)'
        Estimates_full_search_vpid    : '(0|590)'
CREATE TABLE participant2 (
    host_year INT,
    nation CHAR(3),
    gold INT,
    silver INT,
    bronze INT
)
PARTITION BY RANGE (host_year) (
    PARTITION before_2000 VALUES LESS THAN (2000),
    PARTITION before_2008 VALUES LESS THAN (2008)
);
SHOW ALL HEAP HEADER OF participant2;
<00001> Class_name                    : 'participant2'
        Class_oid                     : '(0|467|6)'
        Volume_id                     : 0
        File_id                       : 374
        Header_page_id                : 940
        Overflow_vfid                 : '(-1|-1)'
        Next_vpid                     : '(-1|-1)'
        Unfill_space                  : 1635
        Estimates_num_pages           : 1
        Estimates_num_recs            : 0
        Estimates_avg_rec_len         : 0
        Estimates_num_high_best       : 1
        Estimates_num_others_high_best: 0
        Estimates_head                : 1
        Estimates_best_list           : '((0|940), 16308), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0)'
        Estimates_num_second_best     : 0
        Estimates_head_second_best    : 0
        Estimates_tail_second_best    : 0
        Estimates_num_substitutions   : 0
        Estimates_second_best_list    : '(-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1)'
        Estimates_last_vpid           : '(0|940)'
        Estimates_full_search_vpid    : '(0|940)'
<00002> Class_name                    : 'participant2__p__before_2000'
        Class_oid                     : '(0|467|7)'
        Volume_id                     : 0
        File_id                       : 376
        Header_page_id                : 950
        Overflow_vfid                 : '(-1|-1)'
        Next_vpid                     : '(-1|-1)'
        Unfill_space                  : 1635
        Estimates_num_pages           : 1
        Estimates_num_recs            : 0
        Estimates_avg_rec_len         : 0
        Estimates_num_high_best       : 1
        Estimates_num_others_high_best: 0
        Estimates_head                : 1
        Estimates_best_list           : '((0|950), 16308), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0)'
        Estimates_num_second_best     : 0
        Estimates_head_second_best    : 0
        Estimates_tail_second_best    : 0
        Estimates_num_substitutions   : 0
        Estimates_second_best_list    : '(-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1)'
        Estimates_last_vpid           : '(0|950)'
        Estimates_full_search_vpid    : '(0|950)'
<00003> Class_name                    : 'participant2__p__before_2008'
        Class_oid                     : '(0|467|8)'
        Volume_id                     : 0
        File_id                       : 378
        Header_page_id                : 960
        Overflow_vfid                 : '(-1|-1)'
        Next_vpid                     : '(-1|-1)'
        Unfill_space                  : 1635
        Estimates_num_pages           : 1
        Estimates_num_recs            : 0
        Estimates_avg_rec_len         : 0
        Estimates_num_high_best       : 1
        Estimates_num_others_high_best: 0
        Estimates_head                : 1
        Estimates_best_list           : '((0|960), 16308), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0)'
        Estimates_num_second_best     : 0
        Estimates_head_second_best    : 0
        Estimates_tail_second_best    : 0
        Estimates_num_substitutions   : 0
        Estimates_second_best_list    : '(-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1)'
        Estimates_last_vpid           : '(0|960)'
        Estimates_full_search_vpid    : '(0|960)'
SHOW HEAP HEADER OF participant2__p__before_2008;
<00001> Class_name                    : 'participant2__p__before_2008'
        Class_oid                     : '(0|467|8)'
        Volume_id                     : 0
        File_id                       : 378
        Header_page_id                : 960
        Overflow_vfid                 : '(-1|-1)'
        Next_vpid                     : '(-1|-1)'
        Unfill_space                  : 1635
        Estimates_num_pages           : 1
        Estimates_num_recs            : 0
        Estimates_avg_rec_len         : 0
        Estimates_num_high_best       : 1
        Estimates_num_others_high_best: 0
        Estimates_head                : 1
        Estimates_best_list           : '((0|960), 16308), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0)'
        Estimates_num_second_best     : 0
        Estimates_head_second_best    : 0
        Estimates_tail_second_best    : 0
        Estimates_num_substitutions   : 0
        Estimates_second_best_list    : '(-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1)'
        Estimates_last_vpid           : '(0|960)'
        Estimates_full_search_vpid    : '(0|960)'

SHOW HEAP CAPACITY

It shows the capacity of the table.

SHOW [ALL] HEAP CAPACITY OF table_name;
  • ALL: If “all” is given in syntax, the basic table and its partition table(s) is shown.

This query has the following columns:

Column name

Type

Description

Table_name

VARCHAR(256)

Table name

Class_oid

VARCHAR(64)

Heap file descriptor

Volume_id

INT

Volume identifier where the file reside

File_id

INT

File identifier

Header_page_id

INT

First page identifier (the header page)

Num_recs

BIGINT

Total Number of objects

Num_relocated_recs

BIGINT

Number of relocated records

Num_overflowed_recs

BIGINT

Number of big records

Num_pages

BIGINT

Total number of heap pages

Avg_rec_len

INT

Average object length

Avg_free_space_per_page

INT

Average free space per page

Avg_free_space_per_page_without_last_page

INT

Average free space per page without taking in consideration last page

Avg_overhead_per_page

INT

Average overhead per page

Repr_id

INT

Currently cached catalog column info

Num_total_attrs

INT

total number of columns

Num_fixed_width_attrs

INT

Number of the fixed width columns

Num_variable_width_attrs

INT

Number of variable width columns

Num_shared_attrs

INT

Number of shared columns

Num_class_attrs

INT

Number of table columns

Total_size_fixed_width_attrs

INT

Total size of the fixed width columns

The following shows the examples of this syntax.

-- csql> ;line on
SHOW HEAP CAPACITY OF athlete;
<00001> Table_name                              : 'athlete'
        Class_oid                               : '(0|463|8)'
        Volume_id                               : 0
        File_id                                 : 147
        Header_page_id                          : 590
        Num_recs                                : 6677
        Num_relocated_recs                      : 0
        Num_overflowed_recs                     : 0
        Num_pages                               : 27
        Avg_rec_len                             : 53
        Avg_free_space_per_page                 : 2139
        Avg_free_space_per_page_except_last_page: 1663
        Avg_overhead_per_page                   : 993
        Repr_id                                 : 1
        Num_total_attrs                         : 5
        Num_fixed_width_attrs                   : 3
        Num_variable_width_attrs                : 2
        Num_shared_attrs                        : 0
        Num_class_attrs                         : 0
        Total_size_fixed_width_attrs            : 8
SHOW ALL HEAP CAPACITY OF participant2;
<00001> Table_name                              : 'participant2'
        Class_oid                               : '(0|467|6)'
        Volume_id                               : 0
        File_id                                 : 374
        Header_page_id                          : 940
        Num_recs                                : 0
        Num_relocated_recs                      : 0
        Num_overflowed_recs                     : 0
        Num_pages                               : 1
        Avg_rec_len                             : 0
        Avg_free_space_per_page                 : 16016
        Avg_free_space_per_page_except_last_page: 0
        Avg_overhead_per_page                   : 4
        Repr_id                                 : 1
        Num_total_attrs                         : 5
        Num_fixed_width_attrs                   : 5
        Num_variable_width_attrs                : 0
        Num_shared_attrs                        : 0
        Num_class_attrs                         : 0
        Total_size_fixed_width_attrs            : 20
<00002> Table_name                              : 'participant2__p__before_2000'
        Class_oid                               : '(0|467|7)'
        Volume_id                               : 0
        File_id                                 : 376
        Header_page_id                          : 950
        Num_recs                                : 0
        Num_relocated_recs                      : 0
        Num_overflowed_recs                     : 0
        Num_pages                               : 1
        Avg_rec_len                             : 0
        Avg_free_space_per_page                 : 16016
        Avg_free_space_per_page_except_last_page: 0
        Avg_overhead_per_page                   : 4
        Repr_id                                 : 1
        Num_total_attrs                         : 5
        Num_fixed_width_attrs                   : 5
        Num_variable_width_attrs                : 0
        Num_shared_attrs                        : 0
        Num_class_attrs                         : 0
        Total_size_fixed_width_attrs            : 20
<00003> Table_name                              : 'participant2__p__before_2008'
        Class_oid                               : '(0|467|8)'
        Volume_id                               : 0
        File_id                                 : 378
        Header_page_id                          : 960
        Num_recs                                : 0
        Num_relocated_recs                      : 0
        Num_overflowed_recs                     : 0
        Num_pages                               : 1
        Avg_rec_len                             : 0
        Avg_free_space_per_page                 : 16016
        Avg_free_space_per_page_except_last_page: 0
        Avg_overhead_per_page                   : 4
        Repr_id                                 : 1
        Num_total_attrs                         : 5
        Num_fixed_width_attrs                   : 5
        Num_variable_width_attrs                : 0
        Num_shared_attrs                        : 0
        Num_class_attrs                         : 0
        Total_size_fixed_width_attrs            : 20

SHOW SLOTTED PAGE HEADER

It shows the header information of specified slotted page.

SHOW SLOTTED PAGE HEADER { WHERE|OF } VOLUME = volume_num AND PAGE = page_num;

This query has the following columns:

Column name

Type

Description

Volume_id

INT

Volume id of the page

Page_id

INT

page id of the page

Num_slots

INT

Number of allocated slots for the page

Num_records

INT

Number of records on page

Anchor_type

VARCHAR(32)

One of flowing: ANCHORED, ANCHORED_DONT_REUSE_SLOTS, UNANCHORED_ANY_SEQUENCE, UNANCHORED_KEEP_SEQUENCE

Alignment

VARCHAR(8)

Alignment for records, one of flowing: CHAR, SHORT, INT, DOUBLE

Total_free_area

INT

Total free space on page

Contiguous_free_area

INT

Contiguous free space on page

Free_space_offset

INT

Byte offset from the beginning of the page to the first free byte area on the page

Need_update_best_hint

INT

True if saving is need for recovery (undo)

Is_saving

INT

True if we should update best pages hint for this page.

Flags

INT

Flag value of the page

The following shows the examples of this syntax.

-- csql> ;line on
SHOW SLOTTED PAGE HEADER OF VOLUME=0 AND PAGE=140;
<00001> Volume_id            : 0
        Page_id              : 140
        Num_slots            : 3
        Num_records          : 3
        Anchor_type          : 'ANCHORED_DONT_REUSE_SLOTS'
        Alignment            : 'INT'
        Total_free_area      : 15880
        Contiguous_free_area : 15880
        Free_space_offset    : 460
        Need_update_best_hint: 1
        Is_saving            : 0
        Flags                : 0

SHOW SLOTTED PAGE SLOTS

It shows the information of all slots in the specified slotted page.

SHOW SLOTTED PAGE SLOTS { WHERE|OF } VOLUME = volume_num AND PAGE = page_num;

This query has the following columns:

Column name

Type

Description

Volume_id

INT

Volume id of the page

Page_id

INT

Page id of the page

Slot_id

INT

The slot id

Offset

INT

Byte offset from the beginning of the page to the beginning of the record

Type

VARCHAR(32)

Record type, one of flowing: REC_UNKNOWN, REC_ASSIGN_ADDRESS, REC_HOME, REC_NEWHOME, REC_RELOCATION, REC_BIGONE, REC_MARKDELETED, REC_DELETED_WILL_REUSE

Length

INT

Length of record

Waste

INT

Whether or not wasted

The following shows the examples of this syntax.

-- csql> ;line on
SHOW SLOTTED PAGE HEADER OF VOLUME=0 AND PAGE=140;
<00001> Volume_id: 0
        Page_id  : 140
        Slot_id  : 0
        Offset   : 40
        Type     : 'HOME'
        Length   : 292
        Waste    : 0
<00002> Volume_id: 0
        Page_id  : 140
        Slot_id  : 1
        Offset   : 332
        Type     : 'HOME'
        Length   : 64
        Waste    : 0
<00003> Volume_id: 0
        Page_id  : 140
        Slot_id  : 2
        Offset   : 396
        Type     : 'HOME'
        Length   : 64
        Waste    : 0

SHOW INDEX HEADER

It shows the index header page of the index of the table.

SHOW INDEX HEADER OF table_name.index_name;

If ALL keyword is used and an index name is omitted, it shows the entire headers of the indexes of the table.

SHOW ALL INDEXES HEADER OF table_name;

This query has the following columns:

Column name

Type

Description

Table_name

VARCHAR(256)

Table name

Index_name

VARCHAR(256)

Index name

Btid

VARCHAR(64)

BTID (volid|fileid|root_pageid)

Node_level

INT

Node level (1 for LEAF, 2 or more for NON_LEAF)

Max_key_len

INT

Maximum key length for the subtree

Num_oids

INT

Number of OIDs stored in the Btree

Num_nulls

INT

Number of NULLs (they aren’t stored)

Num_keys

INT

Number of unique keys in the Btree

Topclass_oid

VARCHAR(64)

Topclass oid or NULL OID (non unique index)(volid|pageid|slotid)

Unique

INT

Unique or non-unique

Overflow_vfid

VARCHAR(32)

VFID (volid|fileid)

Key_type

VARCHAR(256)

Type name

Columns

VARCHAR(256)

the list of columns which consists of the index

The following shows the examples of this syntax.

-- Prepare test environment
CREATE TABLE tbl1(a INT, b VARCHAR(5));
CREATE INDEX index_ab ON tbl1(a ASC, b DESC);
-- csql> ;line on
SHOW INDEX HEADER OF tbl1.index_ab;
<00001> Table_name   : 'tbl1'
        Index_name   : 'index_a'
        Btid         : '(0|378|950)'
        Node_type    : 'LEAF'
        Max_key_len  : 0
        Num_oids     : -1
        Num_nulls    : -1
        Num_keys     : -1
        Topclass_oid : '(0|469|4)'
        Unique       : 0
        Overflow_vfid: '(-1|-1)'
        Key_type     : 'midxkey(integer,character varying(5))'
        Columns      : 'a,b DESC'

SHOW INDEX CAPACITY

It shows the index capacity of the index of the table.

SHOW INDEX CAPACITY OF table_name.index_name;

If ALL keyword is used and an index name is omitted, it shows the entire capacity of the indexes of the table.

SHOW ALL INDEXES CAPACITY OF table_name;

This query has the following columns:

Column name

Type

Description

Table_name

VARCHAR(256)

Table name

Index_name

VARCHAR(256)

Index name

Btid

VARCHAR(64)

BTID (volid|fileid|root_pageid)

Num_distinct_key

INT

Distinct key count (in leaf pages)

Total_value

INT

Total number of values stored in tree

Avg_num_value_per_key

INT

Average number of values (OIDs) per key

Num_leaf_page

INT

Leaf page count

Num_non_leaf_page

INT

NonLeaf page count

Num_total_page

INT

Total page count

Height

INT

Height of the tree

Avg_key_len

INT

Average key length

Avg_rec_len

INT

Average page record length

Total_space

VARCHAR(64)

Total space occupied by index

Total_used_space

VARCHAR(64)

Total used space in index

Total_free_space

VARCHAR(64)

Total free space in index

Avg_num_page_key

INT

Average page key count (in leaf pages)

Avg_page_free_space

VARCHAR(64)

Average page free space

The following shows the examples of this syntax.

-- Prepare test environment
CREATE TABLE tbl1(a INT, b VARCHAR(5));
CREATE INDEX index_a ON tbl1(a ASC);
CREATE INDEX index_b ON tbl1(b ASC);
-- csql> ;line on
SHOW INDEX CAPACITY OF tbl1.index_a;
<00001> Table_name           : 'tbl1'
        Index_name           : 'index_a'
        Btid                 : '(0|378|950)'
        Num_distinct_key     : 0
        Total_value          : 0
        Avg_num_value_per_key: 0
        Num_leaf_page        : 1
        Num_non_leaf_page    : 0
        Num_total_page       : 1
        Height               : 1
        Avg_key_len          : 0
        Avg_rec_len          : 0
        Total_space          : '16.0K'
        Total_used_space     : '116.0B'
        Total_free_space     : '15.9K'
        Avg_num_page_key     : 0
        Avg_page_free_space  : '15.9K'
SHOW ALL INDEXES CAPACITY OF tbl1;
<00001> Table_name           : 'tbl1'
        Index_name           : 'index_a'
        Btid                 : '(0|378|950)'
        Num_distinct_key     : 0
        Total_value          : 0
        Avg_num_value_per_key: 0
        Num_leaf_page        : 1
        Num_non_leaf_page    : 0
        Num_total_page       : 1
        Height               : 1
        Avg_key_len          : 0
        Avg_rec_len          : 0
        Total_space          : '16.0K'
        Total_used_space     : '116.0B'
        Total_free_space     : '15.9K'
        Avg_num_page_key     : 0
        Avg_page_free_space  : '15.9K'
<00002> Table_name           : 'tbl1'
        Index_name           : 'index_b'
        Btid                 : '(0|381|960)'
        Num_distinct_key     : 0
        Total_value          : 0
        Avg_num_value_per_key: 0
        Num_leaf_page        : 1
        Num_non_leaf_page    : 0
        Num_total_page       : 1
        Height               : 1
        Avg_key_len          : 0
        Avg_rec_len          : 0
        Total_space          : '16.0K'
        Total_used_space     : '120.0B'
        Total_free_space     : '15.9K'
        Avg_num_page_key     : 0
        Avg_page_free_space  : '15.9K'

SHOW CRITICAL SECTIONS

Total critical section (hereafter CS) information of a database is shown.

SHOW CRITICAL SECTIONS;

This query has the following columns:

Column name

Type

Description

Index

INT

The index of CS

Name

VARCHAR(32)

The name of CS

Num_holders

VARCHAR(16)

The number of CS holders. This has one of these values: ‘N readers’, ‘1 writer’, ‘none’

Num_waiting_readers

INT

The number of waiting readers

Num_waiting_writers

INT

The number of waiting writers

Owner_thread_index

INT

The thread index of CS owner writer, NULL if no owner

Owner_tran_index

INT

Transaction index of CS owner writer, NULL if no owner

Total_enter_count

BIGINT

Total count of enterers

Total_waiter_count

BIGINT

Total count of waiters

Waiting_promoter_thread_index

INT

The thread index of waiting promoter, NULL if no waiting promoter

Max_waiting_msecs

NUMERIC(10,3)

Maximum waiting time (millisecond)

Total_waiting_msecs

NUMERIC(10,3)

Total waiting time (millisecond)

The following shows the examples of this syntax.

SHOW CRITICAL SECTIONS;
Index  Name                       Num_holders           Num_waiting_readers  Num_waiting_writers  Owner_thread_index  Owner_tran_index     Total_enter_count    Total_waiter_count  Waiting_promoter_thread_index  Max_waiting_msecs     Total_waiting_msecs
============================================================================================================================================================================================================================================================
    0  'ER_LOG_FILE'              'none'                                  0                    0                NULL              NULL                   217                     0                           NULL  0.000                 0.000
    1  'ER_MSG_CACHE'             'none'                                  0                    0                NULL              NULL                     0                     0                           NULL  0.000                 0.000
    2  'WFG'                      'none'                                  0                    0                NULL              NULL                     0                     0                           NULL  0.000                 0.000
    3  'LOG'                      'none'                                  0                    0                NULL              NULL                    11                     0                           NULL  0.000                 0.000
    4  'LOCATOR_CLASSNAME_TABLE'  'none'                                  0                    0                NULL              NULL                    33                     0                           NULL  0.000                 0.000
    5  'QPROC_QUERY_TABLE'        'none'                                  0                    0                NULL              NULL                     3                     0                           NULL  0.000                 0.000
    6  'QPROC_LIST_CACHE'         'none'                                  0                    0                NULL              NULL                     1                     0                           NULL  0.000                 0.000
    7   'DISK_CHECK'              'none'                                  0                    0                NULL              NULL                     3                     0                           NULL  0.000                 0.000
    8  'CNV_FMT_LEXER'            'none'                                  0                    0                NULL              NULL                     0                     0                           NULL  0.000                 0.000
    9  'HEAP_CHNGUESS'            'none'                                  0                    0                NULL              NULL                    10                     0                           NULL  0.000                 0.000
    10  'TRAN_TABLE'              'none'                                  0                    0                NULL              NULL                     7                     0                           NULL  0.000                 0.000
    11  'CT_OID_TABLE'            'none'                                  0                    0                NULL              NULL                     0                     0                           NULL  0.000                 0.000
    12  'HA_SERVER_STATE'         'none'                                  0                    0                NULL              NULL                     2                     0                           NULL  0.000                 0.000
    13  'COMPACTDB_ONE_INSTANCE'  'none'                                  0                    0                NULL              NULL                     0                     0                           NULL  0.000                 0.000
    14  'ACL'                     'none'                                  0                    0                NULL              NULL                     0                     0                           NULL  0.000                 0.000
    15  'PARTITION_CACHE'         'none'                                  0                    0                NULL              NULL                     1                     0                           NULL  0.000                 0.000
    16  'EVENT_LOG_FILE'          'none'                                  0                    0                NULL              NULL                     0                     0                           NULL  0.000                 0.000
    17  'LOG_ARCHIVE'             'none'                                  0                    0                NULL              NULL                     0                     0                           NULL  0.000                 0.000
    18  'ACCESS_STATUS'           'none'                                  0                    0                NULL              NULL                     1                     0                           NULL  0.000                 0.000

SHOW TRANSACTION TABLES

It shows internal information of transaction descriptors which is internal data structure to manage each transaction. It only shows valid transactions and the result may not be a consistent snapshot of a transaction descriptor.

SHOW { TRAN | TRANSACTION } TABLES [ WHERE EXPR ];

This query has the following columns:

Column name

Type

Description

Tran_index

INT

Index on the transaction table or NULL for unassigned transaction descriptor slot

Tran_id

INT

Transaction Identifier

Is_loose_end

INT

0 for Ordinary transactions, 1 for loose-end transactions

State

VARCHAR(64)

State of the transaction. Either one of the followings: ‘TRAN_RECOVERY’, ‘TRAN_ACTIVE’, ‘TRAN_UNACTIVE_COMMITTED’, ‘TRAN_UNACTIVE_WILL_COMMIT’, ‘TRAN_UNACTIVE_COMMITTED_WITH_POSTPONE’, ‘TRAN_UNACTIVE_ABORTED’, ‘TRAN_UNACTIVE_UNILATERALLY_ABORTED’, ‘TRAN_UNACTIVE_2PC_PREPARE’, ‘TRAN_UNACTIVE_2PC_COLLECTING_PARTICIPANT_VOTES’, ‘TRAN_UNACTIVE_2PC_ABORT_DECISION’, ‘TRAN_UNACTIVE_2PC_COMMIT_DECISION’, ‘TRAN_UNACTIVE_COMMITTED_INFORMING_PARTICIPANTS’, ‘TRAN_UNACTIVE_ABORTED_INFORMING_PARTICIPANTS’,’TRAN_STATE_UNKNOWN’

Isolation

VARCHAR(64)

Isolation level of the transaction. Either one of the followings: ‘SERIALIZABLE’, ‘REPEATABLE READ’, ‘COMMITTED READ’, ‘TRAN_UNKNOWN_ISOLATION’

Wait_msecs

INT

Wait until this number of milliseconds for locks.

Head_lsa

VARCHAR(64)

First log address of transaction.

Tail_lsa

VARCHAR(64)

Last log record address of transaction.

Undo_next_lsa

VARCHAR(64)

Next log record address of transaction for UNDO purposes.

Postpone_next_lsa

VARCHAR(64)

Next address of a postpone record to be executed.

Savepoint_lsa

VARCHAR(64)

Address of last save-point.

Topop_lsa

VARCHAR(64)

Address of last top operation.

Tail_top_result_lsa

VARCHAR(64)

Address of last partial abort/commit.

Client_id

INT

Unique identifier of client application bind to transaction.

Client_type

VARCHAR(40)

Type of the client. Either one of the followings: ‘SYSTEM_INTERNAL’, ‘DEFAULT’, ‘CSQL’, ‘READ_ONLY_CSQL’, ‘BROKER’, ‘READ_ONLY_BROKER’, ‘SLAVE_ONLY_BROKER’, ‘ADMIN_UTILITY’, ‘ADMIN_CSQL’, ‘LOG_COPIER’, ‘LOG_APPLIER’, ‘RW_BROKER_REPLICA_ONLY’, ‘RO_BROKER_REPLICA_ONLY’, ‘SO_BROKER_REPLICA_ONLY’, ‘ADMIN_CSQL_WOS’, ‘UNKNOWN’

Client_info

VARCHAR(256)

General information of client application.

Client_db_user

VARCHAR(40)

Current login database account from client application.

Client_program

VARCHAR(256)

Program name of client application.

Client_login_user

VARCHAR(16)

Current login user of OS which running the client application.

Client_host

VARCHAR(64)

Host name of client application.

Client_pid

INT

Process id of client application.

Topop_depth

INT

Depth of nested top operation.

Num_unique_btrees

INT

Number of unique btrees contained in unique_stat_info array.

Max_unique_btrees

INT

Size of unique_stat_info_array.

Interrupt

INT

The flag of whether or not interrupt current transaction. 0 for No, 1 for Yes.

Num_transient_classnames

INT

Number of transient classnames by this transaction.

Repl_max_records

INT

Capacity of replication record array.

Repl_records

VARCHAR(20)

Replication record buffer array, display address pointer as 0x12345678 or NULL for 0x00000000.

Repl_current_index

INT

Current position of replication record in the array.

Repl_append_index

INT

Current position of appended record in the array.

Repl_flush_marked_index

INT

Index of flush marked replication record at first.

Repl_insert_lsa

VARCHAR(64)

Insert Replication target LSA.

Repl_update_lsa

VARCHAR(64)

Update Replication target LSA.

First_save_entry

VARCHAR(20)

First save entry for the transaction, display address pointer as 0x12345678 or NULL for 0x00000000.

Tran_unique_stats

VARCHAR(20)

Local statistical info for multiple row. display address pointer as 0x12345678 or NULL for 0x00000000.

Modified_class_list

VARCHAR(20)

List of dirty classes, display address pointer as 0x12345678 or NULL for 0x00000000.

Num_temp_files

INT

Number of temporary files.

Waiting_for_res

VARCHAR(20)

Waiting resource. Just display address pointer as 0x12345678 or NULL for 0x00000000.

Has_deadlock_priority

INT

Whether or not have deadlock priority. 0 for No, 1 for Yes.

Suppress_replication

INT

Suppress writing replication logs when flag is set.

Query_timeout

DATETIME

A query should be executed before query_timeout time or NULL for waiting until query complete.

Query_start_time

DATETIME

Current query start time or NULL for query completed.

Tran_start_time

DATETIME

Current transaction start time or NULL for transaction completed.

Xasl_id

VARCHAR(64)

vpid:(volid|pageid),vfid:(volid|pageid) or NULL for query completed.

Disable_modifications

INT

Disable modification if greater than zero.

Abort_reason

VARCHAR(40)

Reason of transaction aborted. Either one of the followings: ‘NORMAL’, ‘ABORT_DUE_TO_DEADLOCK’, ‘ABORT_DUE_ROLLBACK_ON_ESCALATION’

The following shows the examples of the statement.

SHOW TRAN TABLES WHERE CLIENT_TYPE = 'CSQL';
=== <Result of SELECT Command in Line 1> ===

<00001> Tran_index              : 1
        Tran_id                 : 58
        Is_loose_end            : 0
        State                   : 'ACTIVE'
        Isolation               : 'COMMITTED READ'
        Wait_msecs              : -1
        Head_lsa                : '(-1|-1)'
        Tail_lsa                : '(-1|-1)'
        Undo_next_lsa           : '(-1|-1)'
        Postpone_next_lsa       : '(-1|-1)'
        Savepoint_lsa           : '(-1|-1)'
        Topop_lsa               : '(-1|-1)'
        Tail_top_result_lsa     : '(-1|-1)'
        Client_id               : 108
        Client_type             : 'CSQL'
        Client_info             : ''
        Client_db_user          : 'PUBLIC'
        Client_program          : 'csql'
        Client_login_user       : 'cubrid'
        Client_host             : 'cubrid001'
        Client_pid              : 13190
        Topop_depth             : 0
        Num_unique_btrees       : 0
        Max_unique_btrees       : 0
        Interrupt               : 0
        Num_transient_classnames: 0
        Repl_max_records        : 0
        Repl_records            : NULL
        Repl_current_index      : 0
        Repl_append_index       : -1
        Repl_flush_marked_index : -1
        Repl_insert_lsa         : '(-1|-1)'
        Repl_update_lsa         : '(-1|-1)'
        First_save_entry        : NULL
        Tran_unique_stats       : NULL
        Modified_class_list     : NULL
        Num_temp_files          : 0
        Waiting_for_res         : NULL
        Has_deadlock_priority   : 0
        Suppress_replication    : 0
        Query_timeout           : NULL
        Query_start_time        : 03:10:11.425 PM 02/04/2016
        Tran_start_time         : 03:10:11.425 PM 02/04/2016
        Xasl_id                 : 'vpid: (32766|50), vfid: (32766|43)'
        Disable_modifications   : 0
        Abort_reason            : 'NORMAL'

SHOW THREADS

It shows internal information of each thread. The results are sorted by “Index” column with ascending order and may not be a consistent snapshot of thread entries. The statement under SA MODE shows an empty result.

SHOW THREADS [ WHERE EXPR ];

This query has the following columns:

Column name

Type

Description

Index

INT

Thread entry index.

Jobq_index

INT

Job queue index only for worker threads. NULL for non-worker threads.

Thread_id

BIGINT

Thread id.

Tran_index

INT

Transaction index to which this thread belongs. If no related tran index, NULL.

Type

VARCHAR(8)

Thread type. Either one of the followings: ‘MASTER’, ‘SERVER’, ‘WORKER’, ‘DAEMON’, ‘VACUUM_MASTER’, ‘VACUUM_WORKER’, ‘NONE’, ‘UNKNOWN’.

Status

VARCHAR(8)

Thread status. Either one of the followings: ‘DEAD’, ‘FREE’, ‘RUN’, ‘WAIT’, ‘CHECK’.

Resume_status

VARCHAR(32)

Resume status. Either one of the followings: ‘RESUME_NONE’, ‘RESUME_DUE_TO_INTERRUPT’, ‘RESUME_DUE_TO_SHUTDOWN’, ‘PGBUF_SUSPENDED’, ‘PGBUF_RESUMED’, ‘JOB_QUEUE_SUSPENDED’, ‘JOB_QUEUE_RESUMED’, ‘CSECT_READER_SUSPENDED’, ‘CSECT_READER_RESUMED’, ‘CSECT_WRITER_SUSPENDED’, ‘CSECT_WRITER_RESUMED’, ‘CSECT_PROMOTER_SUSPENDED’, ‘CSECT_PROMOTER_RESUMED’, ‘CSS_QUEUE_SUSPENDED’, ‘CSS_QUEUE_RESUMED’, ‘QMGR_ACTIVE_QRY_SUSPENDED’, ‘QMGR_ACTIVE_QRY_RESUMED’, ‘QMGR_MEMBUF_PAGE_SUSPENDED’, ‘QMGR_MEMBUF_PAGE_RESUMED’, ‘HEAP_CLSREPR_SUSPENDED’, ‘HEAP_CLSREPR_RESUMED’, ‘LOCK_SUSPENDED’, ‘LOCK_RESUMED’, ‘LOGWR_SUSPENDED’, ‘LOGWR_RESUMED’

Net_request

VARCHAR(64)

The net request name in net_requests array, such as: ‘LC_ASSIGN_OID’. If not request name, shows NULL

Conn_client_id

INT

Client id whom this thread is responding, if no client id, shows NULL

Conn_request_id

INT

Request id which this thread is processing, if no request id, shows NULL

Conn_index

INT

Connection index, if not connection index, shows NULL

Last_error_code

INT

Last error code

Last_error_msg

VARCHAR(256)

Last error message, if message length is more than 256, it will be truncated, If no error message, shows NULL

Private_heap_id

VARCHAR(20)

The address of id of thread private memory allocator, such as: 0x12345678. If no related heap id, shows NULL.

Query_entry

VARCHAR(20)

The address of the QMGR_QUERY_ENTRY*, such as: 0x12345678, if no related QMGR_QUERY_ENTRY, shows NULL.

Interrupted

INT

0 or 1, is this request/transaction interrupted

Shutdown

INT

0 or 1, is server going down?

Check_interrupt

INT

0 or 1

Wait_for_latch_promote

INT

0 or 1, whether this thread is waiting for latch promotion.

Lockwait_blocked_mode

VARCHAR(24)

Lockwait blocked mode. Either one of the followings: ‘NULL_LOCK’, ‘IS_LOCK’, ‘S_LOCK’, ‘IS_LOCK’, ‘IX_LOCK’, ‘SIX_LOCK’, ‘X_LOCK’, ‘SCH_M_LOCK’, ‘UNKNOWN’

Lockwait_start_time

DATETIME

Start blocked time, if not in blocked state, shows NULL

Lockwait_msecs

INT

Time in milliseconds, if not in blocked state, shows NULL

Lockwait_state

VARCHAR(24)

The lock wait state such as: ‘SUSPENDED’, ‘RESUMED’, ‘RESUMED_ABORTED_FIRST’, ‘RESUMED_ABORTED_OTHER’, ‘RESUMED_DEADLOCK_TIMEOUT’, ‘RESUMED_TIMEOUT’, ‘RESUMED_INTERRUPT’. If not in blocked state, shows NULL

Next_wait_thread_index

INT

The next wait thread index, if not exist, shows NULL

Next_tran_wait_thread_index

INT

The next wait thread index in lock manager, if not exist, shows NULL

Next_worker_thread_index

INT

The next worker thread index in css_Job_queue.worker_thrd_list, if not exist, shows NULL

The following shows the examples of the statement.

SHOW THREADS WHERE RESUME_STATUS != 'RESUME_NONE' AND STATUS != 'FREE';
=== <Result of SELECT Command in Line 1> ===
<00001> Index                      : 183
        Jobq_index                 : 3
        Thread_id                  : 140077788813056
        Tran_index                 : 3
        Type                       : 'WORKER'
        Status                     : 'RUN'
        Resume_status              : 'JOB_QUEUE_RESUMED'
        Net_request                : 'QM_QUERY_EXECUTE'
        Conn_client_id             : 108
        Conn_request_id            : 196635
        Conn_index                 : 3
        Last_error_code            : 0
        Last_error_msg             : NULL
        Private_heap_id            : '0x02b3de80'
        Query_entry                : '0x7f6638004cb0'
        Interrupted                : 0
        Shutdown                   : 0
        Check_interrupt            : 1
        Wait_for_latch_promote     : 0
        Lockwait_blocked_mode      : NULL
        Lockwait_start_time        : NULL
        Lockwait_msecs             : NULL
        Lockwait_state             : NULL
        Next_wait_thread_index     : NULL
        Next_tran_wait_thread_index: NULL
        Next_worker_thread_index   : NULL
<00002> Index                      : 192
        Jobq_index                 : 2
        Thread_id                  : 140077779339008
        Tran_index                 : 2
        Type                       : 'WORKER'
        Status                     : 'WAIT'
        Resume_status              : 'LOCK_SUSPENDED'
        Net_request                : 'LC_FIND_LOCKHINT_CLASSOIDS'
        Conn_client_id             : 107
        Conn_request_id            : 131097
        Conn_index                 : 2
        Last_error_code            : 0
        Last_error_msg             : NULL
        Private_heap_id            : '0x02bcdf10'
        Query_entry                : NULL
        Interrupted                : 0
        Shutdown                   : 0
        Check_interrupt            : 1
        Wait_for_latch_promote     : 0
        Lockwait_blocked_mode      : 'SCH_S_LOCK'
        Lockwait_start_time        : 10:47:45.000 AM 02/03/2016
        Lockwait_msecs             : -1
        Lockwait_state             : 'SUSPENDED'
        Next_wait_thread_index     : NULL
        Next_tran_wait_thread_index: NULL
        Next_worker_thread_index   : NULL

SHOW JOB QUEUES

It shows the status of job queue. The statement under SA MODE shows an empty result.

SHOW JOB QUEUES;

This query has the following columns:

Column name

Type

Description

Jobq_index

INT

The index of job queue

Num_total_workers

INT

Total number of work threads of the queue

Num_busy_workers

INT

The number of busy worker threads of the queue

Num_connection_workers

INT

The number of connection worker threads of the queue